Setts



I UNITED STATES PATENT OFFICE.

AARON B. BROWN AND WENDELL P. BROWN, OF WORCESTER, MASSACHU- SETTS, ASSIGNORS TO THEODORE P. BROWN, OF SAME PLACE.

COMPOSITION FOR COATING METALS.

SPECIFIGATIONforming part of Letters Patent No. 249,889, dated November 22, 1881,

(No specimens.)

To all whom it may concern:

Be it known that we, AARON B. BROWN and WENDELL P. BROWN, citizens of the United States, residing at Worcester, in the county of Worcesterand State of Massachusetts, have invented new and useful Improvements in Compositions for Coating Metals, of which the following is a specification.

This invention relates toimprovements upon the Letters Patent granted to us October 28,

1879, and numbered 221,028, in which we employed a compound consisting of india-rubber, gum-kauri, gum-(laminar, and wax for the coating of metals which have been manufactured into machinery and other useful contrivances, &c., to prevent rust or corrosion of such manufactured metals in transportation or when otherwise exposed to air and moisture.

Experience and experiments show that a coat- 2o ing for this purpose, to be practicable and efficient, must have certain characteristics or features, such as the following: It must be impervious to air and moisture, and must have consistency and body enough to completely 5 cover the surface to be protected. It must be pliant and elastic, so as to expand and contract with the metal, and without breaking,

cracking, or checking. it must be adhesive,

and of such an adhesive nature that its ex- 0 pansion and contraction will not affect the same to separate it from contact with and adhesion to the metal surface. It must be soft and pliable, and capable of drying readily, and of easy removal when so desired.

This improved coating has the above-named features, and it is composed of ingredients as follows, to wit: one-fourth (i) pound indiarubber; one-eighth pound gutta-percha one-fourth pound gum-dammar, and three- 0 fourths (5%) pound wax. These several ingredients are dissolved in benzole or any other suitable solvent, and for such purpose two gallons of benzole is sufficient, and in practice they are dissolved separately and then 5 mixed together, the whole making a liquid varnish suitable to be applied by a brush or a cloth to the metal surface. The india-rubher is impervious to air and moisture, gives pliability and elasticity, and renders the varnish, when applied as stated, capable of expandin g and contracting with the metal. The

gutta-pcrcha and gum-(laminar give body and thickness to the varnish and cause it to dry more quickly. To give all the body and thickness desired and maintain the proper pliability and elasticity of the varnish when dry, the wax is employed, which wax is preferably what is known as Japanese wax.

The varnish or coating above described applied to metal surfaces protects them against rust or corrosion, and as it is constituted has elasticity, pliability, and imperviousness to air and moisture, adhesiveness and body or 7 thickness, and possesses the same in such a degree that it completely covers and adheres to the surface, does not crack, break, or separate therefrom on exposure, preserves the surface against rust or corrosion from the atmosphere and moisture, and is readily reiiiovcd by simply washing it with spirits of naphtha or spirits of turpentine.

In using this coating it is desirable to first wash the metal surface which is to be coated with an alkaline or other wash which is capable of removing and checking the tendency of the surface to rust and corrode.

We do not limit ourselves to the proportions of ingredients herein set forth, as the same may be varied as circumstances require. For example, the finer and more compact metals, such as polished steel or silver, do not demand such heavy coatings as the coarser metals, such as cast-iron. We have found that a very light solution of the gums will protect silver in an efficient manner.

Having thus described our invention, what we claim, and desire to secure by Letters Patent, is

A coating for metal to prevent rust and corrosion from exposure to air and moisture, the same being composed of india-rubber, guttapercha, gum-dammar, and wax, the whole dissolved in benzolc, substantially in the proportions specified.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

' AARON B. BROWN.

WENDELL P. BROWN.

Witnesses:

JOHN E. SULLIVAN, GEORGE H. BALL. 

